Horizon

Pumpkin is an open-source Minecraft server written entirely in Rust. It is designed for fast, efficient, customizable hosting, using multithreading and adhering to vanilla game mechanics. The project targets Java Edition and Bedrock Edition clients, although Bedrock support is marked as a work in progress. It provides configuration through TOML and implements Minecraft protocol features including encryption, packet compression, server status and ping, world loading and saving, chunk generation, entity spawning, player movement, inventories, combat, commands, permissions, chat, and plugin support. It also supports RCON, queries, and proxy systems including BungeeCord, BungeeGuard, and Velocity. Pumpkin is under heavy development. The server is licensed under GPLv3; its plugin APIs are dual-licensed under MIT or Apache-2.0.

netherite is a from-scratch C and CUDA reimplementation of Minecraft 1.11.2, checked against the original Java game. It provides a batched CUDA reinforcement-learning environment in which multiple worlds step in lockstep on one GPU, with semantic-camera observations; the repository reports a recorded batch reaching 7,200 live worlds. Linux x86_64 supports the full build, CUDA training, and Java-oracle workflow, while macOS provides CPU and Metal game backends without CUDA support. The project does not ship Mojang content and requires a legal Minecraft copy and JDK 8.

Rabbet is a from-scratch C++ 3D game engine with a sparse-set entity-component system, versioned entity handles, dense component pools, and a system-and-resource runtime. Its OpenGL 4.1 renderer provides a forward path with metallic-roughness PBR, a Phong fallback, lighting and shadow maps, emissive surfaces, optional image-based lighting, post-processing, CPU particles, and heightmap or noise terrain. The Forge editor provides a dockable ImGui workspace around a render-to-texture viewport, asset thumbnails, hierarchy reparenting, click-to-pick, snapping gizmos, and Play/Pause/Step/Stop controls that snapshot and restore scenes. Assets use stable UUIDs and .import sidecars; models, textures, audio, materials, shaders, prefabs, and scenes are supported, with scenes stored as readable JSON. Lua behaviors run through sol2 with live hot-reload and inspector-editable fields, while physics uses Jolt rigidbodies and audio uses miniaudio. The repository includes the engine, editor, examples, and tests, including the Orb Hunt demo game. It uses CMake 3.24 or later and a C++20 compiler, supports macOS and Linux, fetches pinned dependencies during configuration, and is licensed under Apache License 2.0.

Bevy is a free, open-source data-driven game engine written in Rust. Its engine and game logic use Bevy ECS, an entity-component system in which components are Rust structs and systems are Rust functions, with parallel scheduling, queries, resources, and change detection. It includes 2D and 3D rendering, a render graph for composable and parallel render pipelines, skeletal and blend-shape animation, GLTF loading, audio, scenes, hot reloading, and an ECS-based UI framework with flexbox-style layout. Bevy supports Windows, macOS, Linux, Web, iOS, and Android, and is distributed under the MIT or Apache 2.0 licenses.

Rust is a systems programming language and toolchain developed by the Rust project. Its compiler, standard library, documentation, package manager and build tool Cargo, formatter rustfmt, linter Clippy, and editor support are maintained in the main repository. The language uses a rich type system and ownership model to enforce memory and thread safety at compile time, while targeting fast, memory-efficient software for critical services, embedded devices, and integration with other languages. Rust is primarily distributed under the MIT and Apache 2.0 licenses, with portions under BSD-like licenses.